Construct 2 can be downloaded and installed to any computer for free, including site-wide at non-commercial institutions like schools. Without a license, it runs as the Free Edition. This has the following limitations:

A maximum of 100 events in a project A maximum of 4 layers in any layout A maximum of 2 effects in a project No folder organisation in the project bar No event search No configurations bar No Families No Preview on LAN Not allowed to be used for commercial purposes (however, it can be used in education and other non-profit organisations)

If your vision so exceeds your ability, then look to something closer.